Need model number & manual

I do not have possession of the tv, it was purchased for my mother in law. She is in a nursing home and is legally blind. She says it won't turn on. However, she can't read the model number for me. She had her roommate give me the following sets of numbers, 501604869 also gave me upc827935511339. Do either of these sound like serial numbers or model numbers? If this makes sense to you, thanks! Andrea

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Are you referring to the DVR function of the TV, if so what country are you both in? I believe the US does not allow the DVR feature on the US model TV's (or didn't when I worked for LG), Canada does.
Check you both have the same software level, look in the support menu for the software revision.

Sometimes, the manufacturer removes the user manual from their website in the case of older device models. If this is the case with the Samsung 933HD, you can find a backup here: Samsung Syncmaster 933HD manual

Boxes can be a pain. Do you have a Video or Av button on the box that you can try and press.

Sounds like TV is set up Ok otherwise the guide image would not go on the screen. My mother in Laws digital box often gives me curry. (first thing to advise - never buy mother in law technology - the old bag will call your cell phone at all hours to figure out why it isnt working - second words of advise - never give mother in law cell phone number)

First thing to do simply unplug the bloody thing from the power socket to reset it.

Failing this It is often the video mode outputs on the box that are not set up properly. Even though the startup image and guide comes on unless the correct video image output is set up properly you will not be able to view the TV.